suggestion failure on some indices

 affects bzr-search

loggerhead/trunk$ bzr search -s a
bzr: ERROR: exceptions.IndexError: list index out of range

Traceback (most recent call last):
  File "/home/robertc/source/baz/bzr-test-fixes/bzrlib/commands.py",
line 848, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/home/robertc/source/baz/bzr-test-fixes/bzrlib/commands.py",
line 797, in run_bzr
    ret = run(*run_argv)
  File "/home/robertc/source/baz/bzr-test-fixes/bzrlib/commands.py",
line 499, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/home/robertc/.bazaar/plugins/search/commands.py", line 68, in
run
    terms = index.suggest(query)
  File "/home/robertc/.bazaar/plugins/search/index.py", line 611, in
suggest
    for node in suggest_index.iter_entries_starts_with(suggest_term):
  File "/home/robertc/.bazaar/plugins/search/index.py", line 1254, in
iter_entries_starts_with
    parsed_range = self._parsed_key_map[lower_index]
IndexError: list index out of range

(The same data is loggerhead's trunk).
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